. A text-book of physiology : for medical students and physicians . Fig. 138.—Diagrams to represent the principle of the ophthalmoscope : A, The orig-inal form of ophthalmoscope, consisting of a piece of glass, M, inclined at a suitable rays from the source of light are reflected into the observed eye, /, and thence returnalong the same lines passing through M to reach the observers eye, //. B, the directmethod with the ophthalmoscopic mirror. The rays of light illuminate the fundus of theobserved eye, /, and thence pass out in parallel rays, if the eye is emmetropic, to reach theobs
. A text-book of physiology : for medical students and physicians . Fig. 138.—Diagrams to represent the principle of the ophthalmoscope : A, The orig-inal form of ophthalmoscope, consisting of a piece of glass, M, inclined at a suitable rays from the source of light are reflected into the observed eye, /, and thence returnalong the same lines passing through M to reach the observers eye, //. B, the directmethod with the ophthalmoscopic mirror. The rays of light illuminate the fundus of theobserved eye, /, and thence pass out in parallel rays, if the eye is emmetropic, to reach theobservers eye, //. C, the indirect method with ophthalmoscopic mirror and intercalatedlens. The rays of light-red lines are brought to a focus within the anterior chamber of theeye and thence diverge to give a general illumination of the interior of the eyeball. Thereturning rays of light are indicated for a single point, b. At a, b, c, a real inverted imageof a portion of the retina is formed in the air, which in turn is focused on the retina of theobservers eye.
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